SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

Report on Form 6-K dated May 31, 2005

Commission File No. 0-28578

DASSAULT SYSTEMES S.A.
(Name of Registrant)

9, Quai Marcel Dassault, B.P. 310, 92156 Suresnes Cedex, France
(Address of Principal Executive Offices)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F
or Form 40-F

Form 20-F    X  Form 40-F       

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation
S-T Rule 101(b)(1):

Yes        No    X 

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation
S-T Rule 101(b)(7):

Yes        No    X 

Indicate by check mark whether by furnishing the information contained in this Form, the registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:

Yes        No    X 

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule
12g3-2(b): 82-___________

ENCLOSURES:

Dassault Systemes S.A. is furnishing under cover of Form 6-K a press release dated May 27, 2005, providing for informational purposes only, a comparison of 2004 financial statements under French GAAP and U.S. GAAP.


FOR INFORMATIONAL PURPOSES ONLY:
COMPARISON OF 2004 FINANCIAL STATEMENTS
UNDER FRENCH GAAP AND U.S. GAAP



PARIS, FRANCE, May 27, 2005 – Dassault Systèmes (DS) (Nasdaq: DASTY; Euronext Paris: #13065, DSY.PA), a worldwide leading software developer of 3D and Product Lifecycle Management (PLM) solutions, is providing, for informational purposes only, a comparison of financial statements prepared in accordance with French GAAP and U.S. GAAP for the year ended December 31, 2004.

The Company released its annual financial results, prepared in accordance with U.S. GAAP in a press release issued on February 9, 2005.

In summary, 2004 revenue was €797 million under both French and U.S. GAAP. French GAAP 2004 EPS was €1.24 per diluted share, or €0.11 lower than U.S. GAAP EPS of €1.35, with the variance primarily accounted for by the different rules regarding goodwill amortization.

In Table 1 the Company has provided a summary of the differences between DS financial statements prepared in accordance with U.S. GAAP and French GAAP, respectively and explanations of any differences between the two. In Tables 2 and 3, the Company has provided financial information for the year ended December 31, 2004 and at December 31, 2004 prepared in accordance with U.S. GAAP and French GAAP.


ABOUT DASSAULT SYSTEMES
As world leader in 3D and PLM (Product Lifecycle Management) solutions, the Dassault Systèmes group brings value to more than 80,000 customers in 80 countries. A pioneer in the 3D software market since 1981, Dassault Systèmes develops and markets PLM application software and services that support industrial processes and provide a 3D vision of the entire life cycle of products from conception to maintenance. Its offering includes integrated PLM solutions for product development (CATIA®, DELMIA®, ENOVIA®, SMARTEAM®), mainstream product design tools (SolidWorks®), and 3D components (Spatial ACIS®). Dassault Systèmes is listed on the Nasdaq (DASTY) and Euronext Paris (#13065, DSY.PA) stock exchanges. For more information, visit http://www.3ds.com.

(See tables on following pages)


TABLE 1
SUMMARY OF DIFFERENCES BETWEEN FINANCIAL STATEMENTS
ESTABLISHED IN U.S. GAAP AND FRENCH GAAP

The differences are summarized below (in thousands of euros):

Net Equity Net Income
U.S. GAAP 759,249 156,418
Goodwill amortization (1) (68,669) (17,996)
Accounting for issuance of SolidWorks shares (2) 9,603 3,651
Stock-options - tax benefits (3)   2,421
Other, net (140)
(117)
As adjusted for French GAAP 700,043
144,377


  (1)

Under French GAAP, goodwill is amortized over its useful life. Under SFAS 142 (“Goodwill and Other Intangible Assets”), goodwill is not amortized. Goodwill amortization is replaced by an annual impairment test implemented at the reporting unit level using fair value measurement.


  (2)

Under French GAAP, the issuance of new shares by SolidWorks, which decreased the Company’s ownership, was recognized as proceeds of stock. Accordingly, a dilution gain was recognized in earnings. Under U.S. GAAP, the gain is not recognized, as reacquisition of shares is contemplated at the time of issuance and the dilution is accounted for as an equity transaction.


  (3)

Under French GAAP, tax deductions relating to stock-compensation arrangements are recognized in earnings. Under US GAAP, when the tax deduction exceeds the financial reporting expense, the incremental tax benefit is reflected as an increase in paid-in capital.



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TABLE 2
DASSAULT SYSTEMES
COMPARISON OF CONSOLIDATED STATEMENT OF INCOME
FOR THE YEAR ENDED DECEMBER 31, 2004
U.S. GAAP AND FRENCH GAAP

All amounts in thousands of euros, except per share data       Year ended
Dec. 31, 2004
U.S. GAAP
    Year ended
Dec. 31, 2004
French GAAP
 
 
Revenue            
        Software       670,943     670,943  
 
        Service and Other       125,609     125,609  
 



        Total Revenue     796,552   796,552  
 
Cost of Revenue    
        Software       21,688     21,688  
 
        Service and Other       100,988     100,988  
 



        Total Cost of Revenue     122,676   122,676  
 



Gross Profit     673,876   673,876  
 
Research, Selling, Administrative and
Acquisition expenses
   
        Research and Development       221,860     222,084  
 
        Marketing and Sales       173,713     173,713  
 
        General Administration       47,118     47,118  
 
        Acquisition Costs       1,394     1,394  
 



        Total Research, Selling, Administration
        and Acquisition expenses
    444,085   444,309  
 



Operating Income     229,791   229,567  
 
Financial revenue and Other       7,467     11,169  
 



Income before income taxes*       237,258     240,736  
 
Income tax expense       80,840     78,363  
 
Amortization of goodwill in French GAAP       N/A     17,996  
 



Net Income     156,418   144,377  
 



Basic net income per share     1.38   1.27  
 
Diluted net income per share     1.35   1.24  
 
Basic weighted average shares outstanding
(in millions)
      113.2     113.2  
Diluted weighted average shares outstanding
(in millions)
      116.2     116.2  

* Income before income taxes includes equity of unconsolidated affiliates – joint ventures


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TABLE 3
DASSAULT SYSTEMES
COMPARISON OF CONSOLIDATED BALANCE SHEET
AT DECEMBER 31, 2004
U.S. GAAP AND FRENCH GAAP

All amounts in thousands of euros       Year ended
Dec. 31, 2004
U.S. GAAP
    Year ended
Dec. 31, 2004
French GAAP
 
 
Assets            
 
Current assets       889,982     889,982  
 
Property and equipment, net       57,183     57,183  
 
Long term investments and loans       22,038     22,038  
 
Investment in equity of unconsolidated affiliates –       771     771  
joint ventures    
 
Long-term deferred tax assets       25,419     25,601  
 
Goodwill (net)       93,096     34,030  
 
Other intangible assets       10,662     10,233  
 



Total Assets     1,099,151   1,039,838  
 
 
Liabilities and shareholders' equity    
 
Current liabilities       298,779     298,779  
 
Long-term obligations       41,123     41,016  
 
Shareholders' equity       759,249     700,043  
 



Total liabilities and shareholders' equity     1,099,151   1,039,838  


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SIGNATURES

                Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.



DASSAULT SYSTEMES S.A.
 
 
                Date: May 31, 2005 By: /s/ Thibault de Tersant
Name: Thibault de Tersant
Title: Executive Vice President,
Finance and Administration